Definition of rough-tree in English:

rough-tree

noun

Nautical
historical
  • A roughly shaped but unfinished spar, especially one carried on a ship as a spare mast.

Origin

Early 17th century; earliest use found in Samuel Purchas. Apparently originally a variant of roof-tree, reflecting a pronunciation with/ʌ/ in the first element (apparently resulting from vowel shortening), but reinterpreted from an early date as if from rough + tree.

Pronunciation

rough-tree

/ˈrʌftriː/